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Full text of "Treatise On Applied Analytical Chemistry(Vol-1)"

238

SPECIAL BRONZES

i gram of the alloy is dissolved in 15-20 c.c. of nitric acid (D 1-3), the
solution evaporated to dryness, the residue taken up with a few drops of
nitric acid and hot water, and the separate determinations carried out as
with ordinary bronzes (q.v.}.

2. Determination of the Phosphorus.—i gram of the sample, as
filings, is dissolved in aqua regia, evaporated to dryness, repeatedly taken
up with hydrochloric acid and evaporated to dryness, and the residue dis-
solved in dilute hydrochloric acid and hot water (400-500 c.c.) and the hot
solution treated with hydrogen sulphide. The precipitate is washed on
a Gooch crucible with hot water saturated with hydrogen sulphide and
acidified with hydrochloric acid and the filtrate evaporated to dryness with
nitric acid.

The residue is dissolved in a little nitric acid and the phosphoric acid
precipitated with ammonium molybdate as in the determination of phos-
phorus in iron.

*

# *

The following table gives the compositions of various types of commercial
lead-bronzes (Guillet, Muspratt, Ledebur) :

TABLE  XXV
Composition of Lead-bronzes


	Cu
	Sn
	Pb    :    Zu
		r
	Ft!
	Sb

I     ...
	84-70
	10-05
	4-00     0-46
		o-u
	__
	0-14

•2      ...
	84-00
	3-00
	4-56 j  8-50
		• —
	—
	—

3    •     •     •
	«3'85
	8-32
	7-36
	0-13
	0-31
	trace
	. —

41   .     .     -
	79-70
	10-00
	9'50
	—
	0-80
	—
	. — •

5    •     •     •
	73-50
	9-50
	9-50
	9-50
	. — .
	0-50
	—

6    ...
	78-01
	10-36
	10-45
	'   •
	o-57
	0-09
	—

Ni

0-26

As

0-04

Manganese -bronzes

Manganese-bronzes, which should not be confused with manganese-
brasses—often improperly given this name—or manganese-copper alloys,
are composed essentially of copper and tin with small proportions of man-
ganese (1-3%). Their analysis comprises :

1.  Determination of the Tin.—As in ordinary bronzes.

2.  Determination of the Lead,  Copper,  Iron,  Manganese  and
Zinc.—The liquid from which the metastannic acid has been separated,
together with the solution of the metals occluded in the metastannic acid,
is evaporated with sulphuric acid and the separate determinations carried
out as with complex brasses.

3.  Determination of the Phosphorus, Arsenic and Sulphur,—See
Ordinary Bronzes.

1 Type adopted by the Italian State Railways.phorus in the metastannic acid separating to be borne in mind.